From 5e7b84e620d7b6bfd5edd7f205ad029ea89f13f7 Mon Sep 17 00:00:00 2001
From: Andreas Bachlechner <62039342+bachandi@users.noreply.github.com>
Date: Tue, 5 Jul 2022 21:47:28 +0200
Subject: [PATCH] Add INHIBIT_LOCKING environment variable to disable rrd
 locking during the cgi call on a per call basis.

---
 man/man5/monitorix.conf.5 | 2 +-
 monitorix.cgi             | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/man/man5/monitorix.conf.5 b/man/man5/monitorix.conf.5
index 78eacc0..7ac8134 100644
--- a/man/man5/monitorix.conf.5
+++ b/man/man5/monitorix.conf.5
@@ -171,7 +171,7 @@ Default value: \fIy\fP
 .P
 .BI enable_rrd_lock
 .RS
-This option will synchronise the rrd file access by creating the file \fI/tmp/monitorix.lock\fP and use it via flock.
+This option will synchronise the rrd file access by creating the file \fI/tmp/monitorix.lock\fP and use it via flock. The read lock during the cgi call can be disabled on a per call basis via setting the environment variable \fIINHIBIT_LOCKING\fP. This is useful for modules that call the cgi function internally.
 .P
 Default value: \fIn\fP
 .RE
diff --git a/monitorix.cgi b/monitorix.cgi
index 23d9dd3..bbc4d39 100755
--- a/monitorix.cgi
+++ b/monitorix.cgi
@@ -580,7 +580,7 @@ if($mode eq "localhost") {
 	my @writers;	# array of file descriptors
 	my $children = 0;
 
-	my $lockfile_handler = lockfile_handler(\%config);
+	my $lockfile_handler = lockfile_handler(\%config) unless $ENV{INHIBIT_LOCKING};
 	global_flock($lockfile_handler, LOCK_SH);
 	foreach (split(',', $config{graph_name})) {
 		my $gn = trim($_);